DEI Reflect-A-Cool is constructed of fiberglass material backed with a layer of aluminized reflective foil to handle direct continuous temperature of 400 degrees Fahrenheit and has many uses such as covering firewalls, marine engine compartments, RVs, in the tub of a racecar where typical mechanical fasteners cannot be used, and industrial applications. Reflect-A-Cool can be trimmed to fit just about any shape. Just measure, trim, face reflective side towards source of radiant heat and remove self-adhesive backing. It's that easy.